package com.yksj.healthtalk.views;

import java.util.Collection;
import java.util.HashSet;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.View;

import com.google.zxing.ResultPoint;
import com.yksj.healthtalk.camera.CameraManager;
import com.yksj.healthtalk.ui.R;

/**
 * This view is overlaid on top of the camera preview. It adds the viewfinder
 * rectangle and partial transparency outside it, as well as the laser scanner
 * animation and result points.
 * 
 * @author dswitkin@google.com (Daniel Switkin)
 */
public final class ViewfinderView extends View {

//	private static final int[] SCANNER_ALPHA = { 0, 64, 128, 192, 255, 192,
//			128, 64 };
	private static final int[] SCANNER_ALPHA = { 255, 255, 255, 255, 255, 255,
		255, 255 };
	private static final long ANIMATION_DELAY = 100L;
	private static final int OPAQUE = 0xFF;

	private final Paint paint;
	private Bitmap resultBitmap;
	private final int maskColor;
	private final int resultColor;
	private final int frameColor;
	private final int laserColor;
	private final int resultPointColor;
	private int scannerAlpha;
	private Collection<ResultPoint> possibleResultPoints;
	private Collection<ResultPoint> lastPossibleResultPoints;
	private int translateY;

	// This constructor is used when the class is built from an XML resource.
	public ViewfinderView(Context context, AttributeSet attrs) {
		super(context, attrs);

		// Initialize these once for performance rather than calling them every
		// time in onDraw().
		paint = new Paint();
		Resources resources = getResources();
		maskColor = resources.getColor(R.color.viewfinder_mask);
		resultColor = resources.getColor(R.color.result_view);
		frameColor = resources.getColor(R.color.viewfinder_laser);
		laserColor = resources.getColor(R.color.viewfinder_laser);
		resultPointColor = resources.getColor(R.color.possible_result_points);
		scannerAlpha = 0;
		possibleResultPoints = new HashSet<ResultPoint>(5);
		new Thread(new Runnable() {

			@Override
			public void run() {
				try {
					Thread.sleep(50);
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
				postInvalidate();
			}
		});
	}

	@Override
	public void onDraw(Canvas canvas) {
		Rect frame = CameraManager.get().getFramingRect();
		if (frame == null) {
			return;
		}
		int width = canvas.getWidth();
		int height = canvas.getHeight();

		// Draw the exterior (i.e. outside the framing rect) darkened
		paint.setColor(resultBitmap != null ? resultColor : maskColor);
		canvas.drawRect(0, 0, width, frame.top, paint);
		canvas.drawRect(0, frame.top, frame.left, frame.bottom + 1, paint);
		canvas.drawRect(frame.right + 1, frame.top, width, frame.bottom + 1,
				paint);
		canvas.drawRect(0, frame.bottom + 1, width, height, paint);

		if (resultBitmap != null) {
			// Draw the opaque result bitmap over the scanning rectangle
			paint.setAlpha(OPAQUE);
			canvas.drawBitmap(resultBitmap, frame.left, frame.top, paint);
		} else {

			// Draw a two pixel solid black border inside the framing rect
			paint.setColor(frameColor);
			// canvas.drawRect(frame.left, frame.top, frame.right + 1, frame.top
			// + 2, paint);
			// canvas.drawRect(frame.left, frame.top + 2, frame.left + 2,
			// frame.bottom - 1, paint);
			// canvas.drawRect(frame.right - 1, frame.top, frame.right + 1,
			// frame.bottom - 1, paint);
			// canvas.drawRect(frame.left, frame.bottom - 1, frame.right + 1,
			// frame.bottom + 1, paint);

			int linewidht = 10;
			canvas.drawRect(1 + frame.left, 1 + frame.top,
					1 + (linewidht + frame.left), 1 + (50 + frame.top), paint);
			canvas.drawRect(1 + frame.left, 1 + frame.top,
					1 + (50 + frame.left), 1 + (linewidht + frame.top), paint);
			canvas.drawRect(-1 + ((0 - linewidht) + frame.right),
					1 + frame.top, -1 + (1 + frame.right),
					1 + (50 + frame.top), paint);
			canvas.drawRect(-1 + (-50 + frame.right), 1 + frame.top, -1
					+ frame.right, 1 + (linewidht + frame.top), paint);
			canvas.drawRect(1 + frame.left, -1 + (-50 + frame.bottom),
					1 + (linewidht + frame.left), -1 + (1 + frame.bottom),
					paint);
			canvas.drawRect(1 + frame.left, -1
					+ ((0 - linewidht) + frame.bottom), 1 + (50 + frame.left),
					-1 + (1 + frame.bottom), paint);
			canvas.drawRect(-1 + ((0 - linewidht) + frame.right), -1
					+ (-50 + frame.bottom), -1 + (1 + frame.right), -1
					+ (1 + frame.bottom), paint);
			canvas.drawRect(-1 + (-50 + frame.right), -1
					+ ((0 - linewidht) + frame.bottom), -1 + frame.right, -1
					+ (linewidht - (linewidht - 1) + frame.bottom), paint);

			// Draw a red "laser scanner" line through the middle to show
			// decoding is active
			paint.setColor(laserColor);
			paint.setAlpha(SCANNER_ALPHA[scannerAlpha]);
			scannerAlpha = (scannerAlpha + 1) % SCANNER_ALPHA.length;

			// int middle = frame.height() / 2 + frame.top;
			// canvas.drawRect(frame.left + 2, middle - 1, frame.right - 1,
			// middle + 2, paint);
			Bitmap bmp = BitmapFactory.decodeResource(getResources(),
					R.drawable.laser);
			int framewidth=frame.right-frame.left;
			Bitmap bitmap; 
			if(framewidth<=bmp.getWidth()){
				bitmap = Bitmap.createBitmap(bmp, 0, 0, framewidth, bmp.getHeight());
			}else{
				bitmap = Bitmap.createBitmap(bmp, 0, 0, bmp.getHeight(), bmp.getHeight());
			}
		
			if (translateY == 0) {
				translateY = frame.top;
			}else {
				translateY = translateY + 10;
				if (translateY == frame.bottom) {
					translateY = 0;
				}
			}
			canvas.drawBitmap(bitmap, frame.left, translateY, paint);
			
			Collection<ResultPoint> currentPossible = possibleResultPoints;
			Collection<ResultPoint> currentLast = lastPossibleResultPoints;
			if (currentPossible.isEmpty()) {
				lastPossibleResultPoints = null;
			} else {
				possibleResultPoints = new HashSet<ResultPoint>(5);
				lastPossibleResultPoints = currentPossible;
				paint.setAlpha(OPAQUE);
				paint.setColor(resultPointColor);
				for (ResultPoint point : currentPossible) {
					canvas.drawCircle(frame.left + point.getX(), frame.top
							+ point.getY(), 6.0f, paint);
				}
			}
			if (currentLast != null) {
				paint.setAlpha(OPAQUE / 2);
				paint.setColor(resultPointColor);
				for (ResultPoint point : currentLast) {
					canvas.drawCircle(frame.left + point.getX(), frame.top
							+ point.getY(), 3.0f, paint);
				}
			}

			// Request another update at the animation interval, but only
			// repaint the laser line,
			// not the entire viewfinder mask.
			postInvalidateDelayed(ANIMATION_DELAY, frame.left, frame.top,
					frame.right, frame.bottom);
		}
	}

	public void drawViewfinder() {
		resultBitmap = null;
		invalidate();
	}

	/**
	 * Draw a bitmap with the result points highlighted instead of the live
	 * scanning display.
	 * 
	 * @param barcode
	 *            An image of the decoded barcode.
	 */
	public void drawResultBitmap(Bitmap barcode) {
		resultBitmap = barcode;
		invalidate();
	}

	public void addPossibleResultPoint(ResultPoint point) {
		possibleResultPoints.add(point);
	}

}
